Scaling of the marginal Beta p of neoclassical tearing modes during power ramp-down experiments in ASDEX Upgrade
Based on the models describing the behaviour of neoclassical tearing modes (NTMs), fits for the seed-island triggered excitation and disappearance of these modes at small Beta values have been tested for an extended parameter range in the p(pi) �v(ii) plane in ASDEX Upgrade. The disappearance of NTMs at the marginal Beta (p,marg) during power ramp-down phases provides input for a direct comparison with models without the influence of the seed-island size. It has been found that for low q95 the NTM remains present until the HL-transition, whereas for higher q95 the mode decays well in H-mode. Scalings for the onset and the marginal Beta (p) for the (3/2)-NTM and the analysis of marginal Beta (p) for the (2/1)-NTM are presented.
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 45 (July 2003) 1369-1384
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0741-3335/45/1369
Record Number: 200316708 / Last updated on: 2003-09-03
Original language: en
Available languages: en